code: def test_meta_access_no_blobs(self):
      dataset = SqlIndexDataset(
          sqlite_metadata_file=METADATA_FILE,
          remove_empty_masks=False,
          subset_lists_file=SET_LIST_FILE,
          subsets=["train"],
          frame_data_builder_FrameDataBuilder_args={
              "dataset_root": ".",
              "box_crop": False,  # required by blob-less accessor
          },
      )
  
      self.assertIsNone(dataset.meta[0].image_rgb)
      self.assertIsNone(dataset.meta[0].fg_probability)
      self.assertIsNone(dataset.meta[0].depth_map)
      self.assertIsNone(dataset.meta[0].sequence_point_cloud)
      self.assertIsNotNone(dataset.meta[0].camera)
  
imports: import logging
  import os
  import unittest
  from collections import Counter
  import pkg_resources
  import torch
  from pytorch3d.implicitron.dataset.sql_dataset import SqlIndexDataset
label_desc: Use image node_id 21 for calling the TestSqlDataset obj's underlying member method code with example usage: obj.test_meta_access_no_blobs() without return types